This system consists of an unheated tray and 7 propagators. (100 pcs./ pallet) Trio Top Electric Windowsill Propagator While windowsills can often provide ideal light conditions for successful propagation, they can also be cool and draughty. This compact electric propagator is a complete nursery for the windowsill. Featuring 7 mini vented propagators, ideally sized for the most gardeners, the Super 7 allows the user to grow a large number of plant varieties on just one unit. The heated base contains a 13 Watt carbon fibre element for even heat distribution. This unit is not thermostatically controlled and is designed to increase the ambient compost temperature by around 8° Centigrade.